kennys0900

I have an 07 G55 and since I've bought it the differential locks didn't work. After a little trouble shooting a vacuum hose was loose for the center differential lock. Once it was working the rear and front still didn't engage. The yellow lights light up and the vacuum pump will run briefly but they never engage. I've been trail riding for over an hour with the buttons left pressed and neither front or rear engage. Just recently I flushed the brake fluid through the front and rear differential locks. The rear flushed fine, but the front only had some drips with 15 psi of pressure on the system. Even though the rear flushed fine it still doesn't engage.
Any help on what to do next? I've researched a lot but never read about this same issue.